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利用水热法合成了Fe3+掺杂的三维分级纳米Bi2WO6,借助X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、透射电镜(HRTEM)、能谱(EDS)、紫外可见漫反射(UV-Vis-DRS)等测试手段对所得样品的相组成、形貌和谱学特征进行了表征。选择罗丹明B为模型污染物研究所得样品在可见光下的催化活性。结果表明,Fe3+掺杂Bi2WO6为新颖的分级纳米结构,且Fe3+掺杂能有效提高Bi2WO6的光催化活性,Fe3+掺杂量对Bi2WO6活性的影响显著;实验结果还表明,所得Fe3+掺杂Bi2WO6催化剂的稳定性较好,易于回收。此外,还对Fe3+掺杂Bi2WO6的光催化活性增强机理进行了研究,缺电子的Fe3+作为电子捕获中心有利于促进光生电子-空穴对的分离,从而提高Bi2WO6的光催化活性。
Fe3 + -doped three-dimensional graded nano-Bi2WO6 was synthesized by hydrothermal method and characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscope (HRTEM), energy dispersive spectroscopy (EDS) UV-Vis-DRS) were used to characterize the phase composition, morphology and spectroscopy of the obtained samples. Rhodamine B was chosen as a model pollutant to study the catalytic activity of the sample under visible light. The results show that Fe3 + -doped Bi2WO6 is a novel graded nanostructure, and Fe3 + doping can effectively improve the photocatalytic activity of Bi2WO6. The effect of Fe3 + doping on the activity of Bi2WO6 is remarkable. The experimental results also show that the obtained Fe3 + -doped Bi2WO6 catalyst Stability is good, easy to recycle. In addition, the mechanism of enhanced photocatalytic activity of Fe3 + -based Bi2WO6 was also studied. The electron-deficient Fe3 + as the electron-trapping center facilitates the separation of photogenerated electron-hole pairs and improves the photocatalytic activity of Bi2WO6.